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公开(公告)号：US06775340B1
公开(公告)日：2004-08-10
申请号：US09687500
申请日：2000-10-13
IPC分类号： H04L700
CPC分类号： H04L25/0236 , H04B2201/70701 , H04L7/04 , H04L25/03337
摘要： A mobile communications system receiver has improved synchronization and channel estimation for receiving a transmitted signal passing through a radio channel. A processor receives and samples the transmitted signal for a plurality of timing hypotheses. A channel estimator hypothesizes unknown symbols at a pilot cluster of the sampled signal and estimates the radio channel of the pilot cluster for each hypothesized symbol sequence. The estimator determines an error corresponding to each hypothesized symbol sequence using the sampled signal, the estimated radio channel and the hypothesized symbols and determines actual timing estimates and actual radio channel estimates by selecting the radio channel estimates associated with the hypothesized symbols and the timing and hypothesis that minimizes the error.
摘要翻译： 移动通信系统接收机具有改进的同步和信道估计，用于接收通过无线电信道的发射信号。 处理器接收并采样所发送的信号用于多个定时假设。 信道估计器假设在采样信号的导频簇处的未知符号，并且针对每个假设的符号序列估计导频簇的无线电信道。 估计器使用采样信号，估计无线电信道和假设符号来确定与每个假设符号序列相对应的误差，并且通过选择与假设符号相关联的无线电信道估计以及时间和假设来确定实际的定时估计和实际的无线电信道估计 这最小化了错误。
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22.发明授权Method and apparatus for digital symbol detection using medium response estimates 有权使用介质响应估计的数字符号检测方法和装置公开(公告)号：US06603827B2
公开(公告)日：2003-08-05
申请号：US09769995
申请日：2001-01-25
IPC分类号： H04B169
CPC分类号： H04B1/707 , H04B7/005 , H04L25/0202 , H04L25/03178 , H04L25/03299
摘要： According to the present invention, the effects of the transmission medium on transmitted information symbols are estimated separately from other effects, e.g., those associated with receive and transmit filters, using knowledge of the pulse shaping. The medium response estimate is then used to detect information symbols. Previously, receivers had used estimates of the composite channel to detect symbols. This, however, assumed uncorrelated noise, which is not always the case.
摘要翻译： 根据本发明，利用脉冲整形的知识，传输介质对所发送的信息符号的影响与其他效果（例如与接收和发射滤波器相关的效果）分开估计。 然后使用介质响应估计来检测信息符号。 以前，接收机已经使用复合信道的估计来检测符号。 然而，这是假设不相关的噪音，并不总是这样。
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23.发明授权System and methods for selecting an appropriate detection technique in a radiocommunication system 失效在无线电通信系统中选择合适的检测技术的系统和方法公开(公告)号：US06333953B1
公开(公告)日：2001-12-25
申请号：US08897309
申请日：1997-07-21
IPC分类号： H03K900
CPC分类号： H04L25/03006 , H04L25/02
摘要： Techniques for adapting detection schemes used in receivers for receiving radio signals are described. The received signal is processed to determine, for example, an amount of time dispersion present in the radio channel. Based on this determination an appropriate detection scheme is selected for detecting the transmitted symbols. Various techniques for determining the dispersive or non-dispersive nature of the channel are described.
摘要翻译： 描述用于适应用于接收无线电信号的接收机中使用的检测方案的技术。 处理接收到的信号以确定例如存在于无线电信道中的时间色散量。 基于该确定，选择适当的检测方案来检测所发送的符号。 描述了用于确定通道的分散性或非分散性的各种技术。
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24.发明授权Multiple access coding using bent sequences for mobile radio communications 失效使用用于移动无线电通信的弯曲序列的多址接入编码
公开(公告)号：US5550809A
公开(公告)日：1996-08-27
申请号：US291693
申请日：1994-08-16
申请人： Gregory E. Bottomley , Paul W. Dent
发明人： Gregory E. Bottomley , Paul W. Dent
IPC分类号： H04Q7/38 , H01J13/00 , H04B1/707 , H04J11/00 , H04J13/00 , H04J13/12 , H04J13/16 , H04L1/00 , H04L1/02 , H04L9/00 , H04L9/18
CPC分类号： H04L1/0057 , H04B1/707 , H04J13/00 , H04J13/0048 , H04J13/12 , H04J13/004 , H04J13/16 , H04L2209/04 , H04L2209/34
摘要： Information symbols spread using orthogonal or bi-orthogonal codewords are assigned a unique scramble mask that is taken from a set of scramble masks having selected correlation properties. The set of scramble masks is selected such that the correlation between the modulo-2 sum of two scramble masks with any codeword is a constant magnitude, independent of the codeword and the individual masks being compared. In one embodiment, when any two masks are summed using modulo-2 arithmetic, the Walsh transformation of that sum results in a maximally flat Walsh spectrum. For cellular radio telephone systems using subtractive CDMA demodulation techniques, a two-tier ciphering system ensures security at the cellular system level by using a pseudorandomly generated code key to select one of the scramble masks common to all of the mobile stations in a particular cell. Also, privacy at the individual mobile subscriber level is ensured by using a pseudorandomly generated ciphering key to encipher individual information signals before the scrambling operation.
摘要翻译： 使用正交或双正交码字扩展的信息符号被分配为从具有所选相关属性的一组加扰掩码取得的唯一加扰掩码。 选择这组加扰掩码，使得两个加扰掩模与任何码字的模2之和之间的相关性是恒定的量级，与码字和被比较的各个掩码无关。 在一个实施例中，当使用模2算术对任何两个掩模求和时，该和的沃尔什变换导致最大平均沃尔什频谱。 对于使用减法CDMA解调技术的蜂窝无线电话系统，双层加密系统通过使用伪随机生成的代码密钥来选择在特定小区中的所有移动站公共的加密掩码之一来确保蜂窝系统级的安全性。 此外，通过在加扰操作之前使用伪随机生成的加密密钥来加密各个信息信号来确保个人移动用户级别的隐私。
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25.发明授权Method and apparatus for detecting a plurality of symbol blocks using a decoder 有权用于使用解码器检测多个符号块的方法和装置公开(公告)号：US08630372B2
公开(公告)日：2014-01-14
申请号：US13594191
申请日：2012-08-24
CPC分类号： H04L25/03286 , H04L25/03178 , H04L25/03331 , H04L2025/03426
摘要： Teachings presented herein offer a technique for using a demodulator to improve a demodulation process. For example, a demodulation unit according to an embodiment of the present invention may be a multi-stage demodulator and may include: a demodulator configured to receive a baseband signal and configured to produce modem bit likelihood values based on the received baseband signal; a decoder configured to receive and process the modem bit likelihood values to produce improved modem bit likelihood values; a candidate value generator configured to produce, based on the improved modem bit likelihood values, candidate symbol values for a group of one or more symbols; and a detector configured to receive the baseband signal and the candidate symbol values and configured to produce one of (a) final modem bit estimates and (b) candidate symbol values for a group of symbols.
摘要翻译： 本文提出的教学提供了一种使用解调器来改进解调过程的技术。 例如，根据本发明的实施例的解调单元可以是多级解调器，并且可以包括：解调器，被配置为接收基带信号并被配置为基于接收到的基带信号产生调制解调器比特似然值; 解码器，被配置为接收和处理调制解调器比特似然值以产生改进的调制解调器比特似然值; 候选值生成器，被配置为基于改进的调制解调器比特似然值产生一个或多个符号的组的候选符号值; 以及检测器，被配置为接收基带信号和候选符号值，并且被配置为产生（a）最终调制解调器比特估计和（b）一组符号的候选符号值中的一个。
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26.发明授权Method and apparatus for symbol detection via reduced complexity sequence estimation processing 有权通过降低复杂度序列估计处理的符号检测方法和装置公开(公告)号：US08559561B2
公开(公告)日：2013-10-15
申请号：US12035932
申请日：2008-02-22
申请人： Gregory E. Bottomley
发明人： Gregory E. Bottomley
IPC分类号： H04L27/00
CPC分类号： H04L25/03292
摘要： Teachings presented herein offer the performance advantages of sequence estimation for received signal symbol detection, while simultaneously providing potentially significant reductions in computational overhead. Initial demodulation of a received signal identifies a reduced number of candidate symbol values for all or a subset of a sequence of symbols represented in a received signal. A sequence estimation process, e.g., an MLSE process, constrains its state spaces to the reduced number of candidate symbols values, rather than considering all possible symbol values.
摘要翻译： 本文提供的教学提供了接收信号符号检测的序列估计的性能优势，同时提供潜在的显着降低计算开销。 接收信号的初始解调识别在接收信号中表示的符号序列的全部或子集的候选符号值的减少数量。 序列估计过程，例如MLSE过程，将其状态空间限制为减少的候选符号值的数量，而不是考虑所有可能的符号值。
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公开(公告)号：US08498325B2
公开(公告)日：2013-07-30
申请号：US12016608
申请日：2008-01-18
IPC分类号： H04B1/00
CPC分类号： H04B1/712 , H04B2201/709727
摘要： The teachings presented herein improve the processing of individual signals of interest included in a received composite signal by computing combining weights and/or signal quality estimates for each signal of interest, e.g., for linear equalization, based on either shared or non-shared correlation estimates. As a non-limiting advantage, the use of shared correlation estimates reduces computational loading as compared to the processing load that would be needed for computing non-shared correlation estimates for all signals of interest. As a further non-limiting advantage, the conditional use of shared and non-shared correlation estimates provides for the use of non-shared correlation estimates where signal characteristic(s) of one or more of the signals of interest warrant such usage, e.g., for one or more high-rate signals of interest.
摘要翻译： 本文提出的教导通过基于共享或非共享相关估计来计算每个感兴趣信号的组合权重和/或信号质量估计，例如用于线性均衡，来改进包括在接收到的复合信号中的感兴趣的各个信号的处理 。 作为非限制性优点，与用于计算所有感兴趣的信号的非共享相关估计所需的处理负载相比，共享相关估计的使用减少了计算负载。 作为进一步的非限制性优点，共享和非共享相关估计的条件使用提供了使用非共享相关估计，其中一个或多个感兴趣信号的信号特征允许这种使用，例如， 用于一个或多个感兴趣的高速率信号。
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28.发明授权公开(公告)号：US08295330B2
公开(公告)日：2012-10-23
申请号：US12177498
申请日：2008-07-22
申请人： Ning He , Gregory E. Bottomley , Erik Larsson
发明人： Ning He , Gregory E. Bottomley , Erik Larsson
IPC分类号： H04B1/00
CPC分类号： H04B1/712 , H04B2201/709727
摘要： According to the teachings presented herein, a method and apparatus for communication signal processing advantageously use a mix of parametric and non-parametric correlation estimation in communication signal processing. Non-parametric estimation generates an “overall” correlation estimate for a received communication signal, and parametric estimation generates a “component” correlation estimate. The component correlation estimate is removed from the overall correlation estimate to form a partial correlation estimate that is used to process the received communication signal at least initially, such as in a pre-equalization stage. The overall and component correlation estimates are generated as impairment and/or data correlation estimates.
摘要翻译： 根据本文给出的教导，用于通信信号处理的方法和装置有利地在通信信号处理中使用参数和非参数相关估计的混合。 非参数估计对接收到的通信信号产生总体相关估计，参数估计产生分量相关估计。 从总体相关估计中去除分量相关估计，以形成一个部分相关估计，该估计用于至少最初处理接收的通信信号，例如在预均衡阶段。 总体和分量相关估计是作为减值和/或数据相关估计产生的。
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公开(公告)号：US08179988B2
公开(公告)日：2012-05-15
申请号：US12278186
申请日：2006-02-03
CPC分类号： H04L25/022 , H04L5/0017 , H04L5/0023 , H04L27/2607 , H04L27/265 , H04L27/2653 , H04L27/2662 , H04W16/14
摘要： Method, communication system, receiver, baseband processor and computer program for recovering data from a received OFDM-signal containing recurrent redundant information where part of the recurrent redundant information is used to maximize the SINR (Signal to Interference plus Noise Ratio) of the received OFDM-signal.
摘要翻译： 方法，通信系统，接收机，基带处理器和计算机程序，用于从接收的包含循环冗余信息的OFDM信号中恢复数据，其中部分循环冗余信息用于使接收的OFDM的SINR（信号干扰加噪声比）最大化 -信号。
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公开(公告)号：US08126043B2
公开(公告)日：2012-02-28
申请号：US12035846
申请日：2008-02-22
CPC分类号： H04L25/03203 , H04B1/7105 , H04L25/03248 , H04L25/03318 , H04L2025/0342
摘要： Teachings presented herein combine the relative simplicity of equalization with the performance of maximum likelihood (ML) processing. These teachings are applied to the detection of symbols in a stream of symbol blocks. In one or more embodiments, block-based equalization, including feedforward filtering, suppresses inter-block interference and produces detection statistics for the symbols in each symbol block, and joint detection addresses intra-block interference by jointly detecting the most likely combination of symbols within each symbol block, based on the corresponding detection statistics. The joint detection obviates the need to address intra-block interference within the equalization filters, while, at the same time, the block-based equalization produces detection statistics for each symbol block thereby simplifying the joint detection process. Overall complexity is less than would be needed for full MLSE processing of the symbol blocks without equalization preprocessing, while performance is close to or on par with full MLSE processing.
摘要翻译： 本文提出的教学将均衡的相对简单性与最大似然（ML）处理的性能相结合。 这些教导应用于符号块流中符号的检测。 在一个或多个实施例中，包括前馈滤波的基于块的均衡抑制块间干扰并且产生每个符号块中的符号的检测统计，并且联合检测通过联合检测在块内干扰中最可能的符号组合 每个符号块，根据相应的检测统计。 联合检测不需要解决均衡滤波器内的块内干扰，同时基于块的均衡产生每个符号块的检测统计量，从而简化了联合检测过程。 总体复杂度小于没有均衡预处理的符号块的全MLSE处理所需要的，而性能接近于或与完全MLSE处理相当。
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